PAT 20A/B Chapter Notes - Chapter 45: Hair Loss, Hemorrhoid, Hypersensitivity
9 May 2016
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Document Summary
Colonic polyps arise from the mucosal surface of the colon and project into the lumen. They may be sessile (flat, broad based. And attached directly to the intestinal wall) or pedunculated (attached to the intestinal wall by a stalk). Polyps tend to be sessile when small and becomes pedunculated as they enlarge, especially if they are in the left or descending colon. Mostly commonly found in the rectosigmoid area. Although most polyps are asymptomatic, rectal bleeding or occult blood in the stool are the most common manifestation. Hyperplastic: originate from the epithelium and are non-neoplastic growth. They rarely grow larger than 5 mm and never cause clinical symptoms: other benign (non-neoplastic) polyps include inflammatory polyps, lipomas, and juvenile polyps. Adenomatous polyps: characterized by neoplastic changes in the epithelium. There are three types, with tubular adenomas being the most prevalent. The risk of the cancer in the polyp increases with polyps size of turning cancerous than tubular adenomas.
